Insight into the mechanism of CO₂ adsorption on Cu-BTC and its composites with graphite oxide or aminated graphite oxide

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• 作者：Yunxia Zhao ; Mykola Seredych ; Jacek Jagiello ; Qin Zhong ; Teresa J. B ; osz
• 关键词：Carbon dioxide adsorption ; Metal&ndash ; organic frameworks ; Aminated graphite oxide ; Isosteric heat of adsorption ; Regenerability
• 刊名：Chemical Engineering Journal
• 出版年：1 March, 2014
• 年：2014
• 卷：239
• 期：Complete
• 页码：399-407
• 全文大小：2618 K

文摘

CO₂ adsorption on Cu-BTC and its composites with graphite oxide or aminated graphite oxide was evaluated at 273 K and 295 K under the pressure up to 鈭?.1 MPa. The samples before and after CO₂ adsorption were characterized using X-ray diffraction, FT-IR spectroscopy and thermal analysis. The isosteric heats of adsorption were calculated from the experimental adsorption isotherms. The results indicate that CO₂ is physically adsorbed on Cu-BTC and its composites with graphite oxide or aminated graphite oxide. The primary adsorption sites are open copper centers and cage window sites. The composite of Cu-BTC and modified graphite oxide with the highest degree of structural and chemical heterogeneity (MOF/GO-U3) shows the highest CO₂ capacity (8.45 mmol/g at 273 K and 4.78 mmol/g at 295 K) and excellent regenerability with a relatively low and constant over a broad range of surface coverage isosteric heat of adsorption (average value 鈭?4.8 kJ/mol).